1.   Jordi has 4 pairs of shoes. Nuria has 5 pairs of shoes. Which number sentence best tells how many pairs of shoes they have in all?
    A. 9 − 4 = 5 B. 4 + 5 = 9
    C. 9 + 9 = 18 D. 9 − 5 = 4
    Hint
  2.   Compare. Use <, >, or =

21 − 9 ___ 5 + 8
    A. >  B. =
    C. <  D. none of these
    Hint
  3.   Compare. Use <, >, or =

25 + 13 ___ 17 + 21
    A. = B. > 
    C. all of these D. < 
    Hint
  4.   Compare. Use <, >, or =

42 − 30 ___ 21 − 10
    A. <  B. either > or =
    C. >  D. =
    Hint
  5.   Which makes this number sentence true, + or − ?

45 __ 10 < 30 + 20
    A. + B. either + or −
    C. neither + or − D. −
    Hint